18 May: Four killed, 17 injured in Taiz city, 250km south of Sana’a, as thousands of anti-government protesters clash with police and alleged government-paid thugs.

20 May: Hundreds of thousands of protesters demonstrate in Sana’a and 16 other cities on what they call "Friday of Alignment". Thousands of Saleh's supporters rally at al-Sabeen Square, near the presidential palace in Sana’a.

22 May: Anti-government youth, together with troops of the First Armoured Division which defected from the regime, hold rally in Sana’a on the 21st anniversary of unity between north and south. Secretary-General of Gulf Cooperation Council (GCC) Abdullatif al-Zayani and other Arab and foreign diplomats evacuated by helicopter from the United Arab Emirates embassy in Sana’a after a 10-hour siege by hundreds of Saleh's armed supporters protesting against Saleh's scheduled signature of the GCC-proposed transition plan.

23 May: Three killed, 25 injured in clashes in the northern Hasaba district of Sana’a, between government troops and armed tribesmen loyal to Sheikh Sadiq al-Ahmar, leader of the Hashid Tribal Confederation and one of the key supporters of the so-called "Youth Revolution". Hundreds of families flee their homes as a result.

25 May: Four killed, more than 10 injured in renewed clashes between troops and al-Ahmar's supporters. In Zinjibar city, capital of Abyan Governorate, some 500km southeast of Sana’a, two killed, several injured after militant groups, believed to be affiliated with al-Qaeda, take control of the city.

26 May: At least 44 die in clashes, as forces loyal to Saleh move against al-Ahmar's compound in Sana’a after the tribal leader took control of several public buildings.

27 May: Al-Ahmar tells rally in Sana’a that there is now a ceasefire between his and Saleh’s forces in the city.

28 May: Three French humanitarian workers reportedly missing in Hadhramaut Governorate, some 900km east of Sana’a.

29 May: More than 50 protesters killed, several dozen injured as Saleh-aligned forces raid protesters’ tents in Liberty Square, Taiz. "They [government forces] used tanks and bulldozers against protesters and burnt down their tents. Some bodies couldn't be identified after being burnt," Badea al-Qadasi, an eyewitness from the city, tells IRIN.

30 May: Thousands of civilians flee Zinjibar to Aden and other neighbouring governorates as the government steps up air strikes against militant groups. Nine civilians reportedly killed in the strikes.

31 May: More than seven killed as clashes between al-Ahmar supporters and government troops spread to northeastern and northwestern Sana’a. Rockets fired at al-Ahmar's house in Sana’a from nearby hills. In Taiz, seven killed in clashes with police as hundreds of protesters again attempt to camp out in Liberty Square. In Abyan, 10 soldiers reportedly killed in clashes with militant groups.

1 June: At least five killed and more than 10 injured in street battles in Taiz between Republican Guard members, led by Saleh's son Ahmad, and armed tribesmen from rural areas in Taiz Governorate, in retaliation for government raids on the protesters (their sons). New tents erected in Liberty Square.

3 June: Saleh injured in rocket attack on his presidential palace. Seven of his personal guards killed and many senior government officials (including prime minister, parliament speaker and Shura council chairman) seriously injured. Hundreds of thousands of anti-government protesters demonstrate in Sana’a and other main cities on what they called "Friday of Loyalty to Taiz martyrs". Saleh voice message accuses al-Ahmar family of attempting to assassinate him.

8 June: Saleh supporters in Sana’a, Dhamar, Hajja and Mahweet cities mark successful surgery on Saleh by firing in the air. One killed, dozens injured by stray bullets in Sana’a.

10 June: Tens of thousands take to streets in Sana’a and other cities on what the protesters call "Friday of Commitment to Objectives of the Peaceful Revolution". They demand that Vice-President Abdurabu Mansour Hadi, who is constitutionally the president in charge, form a transitional council to run the country and prepare for presidential elections. Saleh's supporters rally in Sana’a on what they call "Friday of Loyalty to Our Leader".

17 June: Hundreds of thousands of protesters demonstrate in Sana’a and other cities on what they call "Friday of Revolutionary Legitimacy". Mohammed al-Muqbli, a key leader in the youth revolution, says: "Forming a transitional council is the only option available before us for the time being."

21 June: Tens of thousands take to streets of Sana’a and other cities demanding Hadi announce a transitional council, excluding Saleh's family. Sheikh Sadeq al-Ahmar sends a letter to Abdullah Bin Abdulaziz, the king of Saudi Arabia, urging him not to allow Saleh to return home. Al-Ahmar warns that Saleh’s return will cause a civil war in Yemen.

22 June: US Assistant Secretary of State for Near East Affairs Jeffery Feltman holds power transition talks with ruling party officials and opposition leaders in Sana’a. More than 60 al-Qaeda inmates escape from jail in Hadhramaut Governorate.

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Thousands of civilians have fled their homes in the coastal town of Zinjibar, capital of Yemen’s Abyan Governorate, some 500km southeast of Sana’a, following three days of intensified army ground attacks and air strikes against militants who stormed the city on 28 May, local media report.